Refer to the graphic. RTA and RTB have established a GRE tunnel, but only RTA has enabled the keepalive function. When RTB receive a keepalive message from RTA, how will RTB respond?
A. RTB will discard the keepalive message.
B. RTB willl record receipt of the keepalive message but won’t reply
C. RTB will send a keepalive in response.
D. RTB will send a keepalive reply and begin to actively send keepalive messages.
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